Three cases of feline lymphocytosis are described. The disease has been recently reported and probably represents an indolent lymphoma. Three cats of 11-14 years of age were presented for various skin lesions: facial erythematous plaques, localized or diffuse alopecia with erythema and focal ulcers. Histological diagnosis confirmed cutaneous lymphocytosis and immunohistochemistry identified the infiltrating cells as T lymphocytes. All cases were treated with glucocorticoids alone or in combination with chlorambucile, with partial remission. One cat died suddenly eight months after the diagnosis and another cat was euthanized two years after the diagnosis for renal failure; the third cat is alive at the time of writing and apparently has no internal organs involvement.
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